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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;
 #include &quot;tabletcanvas.h&quot;

 MainWindow::MainWindow(TabletCanvas *canvas)
 {
     myCanvas = canvas;
     createActions();
     createMenus();

     myCanvas-&gt;setColor(Qt::red);
     myCanvas-&gt;setLineWidthType(TabletCanvas::LineWidthPressure);
     myCanvas-&gt;setAlphaChannelType(TabletCanvas::NoAlpha);
     myCanvas-&gt;setColorSaturationType(TabletCanvas::NoSaturation);

     setWindowTitle(tr(&quot;Tablet Example&quot;));
     setCentralWidget(myCanvas);
 }

 void MainWindow::brushColorAct()
 {
     QColor color = QColorDialog::getColor(myCanvas-&gt;color());

     if (color.isValid())
         myCanvas-&gt;setColor(color);
 }

 void MainWindow::alphaActionTriggered(QAction *action)
 {
     if (action == alphaChannelPressureAction) {
         myCanvas-&gt;setAlphaChannelType(TabletCanvas::AlphaPressure);
     } else if (action == alphaChannelTiltAction) {
         myCanvas-&gt;setAlphaChannelType(TabletCanvas::AlphaTilt);
     } else {
         myCanvas-&gt;setAlphaChannelType(TabletCanvas::NoAlpha);
     }
 }

 void MainWindow::lineWidthActionTriggered(QAction *action)
 {
     if (action == lineWidthPressureAction) {
         myCanvas-&gt;setLineWidthType(TabletCanvas::LineWidthPressure);
     } else if (action == lineWidthTiltAction) {
         myCanvas-&gt;setLineWidthType(TabletCanvas::LineWidthTilt);
     } else {
         myCanvas-&gt;setLineWidthType(TabletCanvas::NoLineWidth);
     }
 }

 void MainWindow::saturationActionTriggered(QAction *action)
 {
     if (action == colorSaturationVTiltAction) {
         myCanvas-&gt;setColorSaturationType(TabletCanvas::SaturationVTilt);
     } else if (action == colorSaturationHTiltAction) {
         myCanvas-&gt;setColorSaturationType(TabletCanvas::SaturationHTilt);
     } else if (action == colorSaturationPressureAction) {
         myCanvas-&gt;setColorSaturationType(TabletCanvas::SaturationPressure);
     } else {
         myCanvas-&gt;setColorSaturationType(TabletCanvas::NoSaturation);
     }
 }

 void MainWindow::saveAct()
 {
     QString path = QDir::currentPath() + &quot;/untitled.png&quot;;
     QString fileName = QFileDialog::getSaveFileName(this, tr(&quot;Save Picture&quot;),
                              path);

     if (!myCanvas-&gt;saveImage(fileName))
         QMessageBox::information(this, &quot;Error Saving Picture&quot;,
                                  &quot;Could not save the image&quot;);
 }

 void MainWindow::loadAct()
 {
     QString fileName = QFileDialog::getOpenFileName(this, tr(&quot;Open Picture&quot;),
                                                     QDir::currentPath());

     if (!myCanvas-&gt;loadImage(fileName))
         QMessageBox::information(this, &quot;Error Opening Picture&quot;,
                                  &quot;Could not open picture&quot;);
 }

 void MainWindow::aboutAct()
 {
     QMessageBox::about(this, tr(&quot;About Tablet Example&quot;),
                        tr(&quot;This example shows use of a Wacom tablet in Qt&quot;));
 }

 void MainWindow::createActions()
 {
     brushColorAction = new QAction(tr(&quot;&amp;Brush Color...&quot;), this);
     brushColorAction-&gt;setShortcut(tr(&quot;Ctrl+C&quot;));
     connect(brushColorAction, SIGNAL(triggered()),
             this, SLOT(brushColorAct()));

     alphaChannelPressureAction = new QAction(tr(&quot;&amp;Pressure&quot;), this);
     alphaChannelPressureAction-&gt;setCheckable(true);

     alphaChannelTiltAction = new QAction(tr(&quot;&amp;Tilt&quot;), this);
     alphaChannelTiltAction-&gt;setCheckable(true);

     noAlphaChannelAction = new QAction(tr(&quot;No Alpha Channel&quot;), this);
     noAlphaChannelAction-&gt;setCheckable(true);
     noAlphaChannelAction-&gt;setChecked(true);

     alphaChannelGroup = new QActionGroup(this);
     alphaChannelGroup-&gt;addAction(alphaChannelPressureAction);
     alphaChannelGroup-&gt;addAction(alphaChannelTiltAction);
     alphaChannelGroup-&gt;addAction(noAlphaChannelAction);
     connect(alphaChannelGroup, SIGNAL(triggered(QAction *)),
             this, SLOT(alphaActionTriggered(QAction *)));

     colorSaturationVTiltAction = new QAction(tr(&quot;&amp;Vertical Tilt&quot;), this);
     colorSaturationVTiltAction-&gt;setCheckable(true);

     colorSaturationHTiltAction = new QAction(tr(&quot;&amp;Horizontal Tilt&quot;), this);
     colorSaturationHTiltAction-&gt;setCheckable(true);

     colorSaturationPressureAction = new QAction(tr(&quot;&amp;Pressure&quot;), this);
     colorSaturationPressureAction-&gt;setCheckable(true);

     noColorSaturationAction = new QAction(tr(&quot;&amp;No Color Saturation&quot;), this);
     noColorSaturationAction-&gt;setCheckable(true);
     noColorSaturationAction-&gt;setChecked(true);

     colorSaturationGroup = new QActionGroup(this);
     colorSaturationGroup-&gt;addAction(colorSaturationVTiltAction);
     colorSaturationGroup-&gt;addAction(colorSaturationHTiltAction);
     colorSaturationGroup-&gt;addAction(colorSaturationPressureAction);
     colorSaturationGroup-&gt;addAction(noColorSaturationAction);
     connect(colorSaturationGroup, SIGNAL(triggered(QAction *)),
             this, SLOT(saturationActionTriggered(QAction *)));

     lineWidthPressureAction = new QAction(tr(&quot;&amp;Pressure&quot;), this);
     lineWidthPressureAction-&gt;setCheckable(true);
     lineWidthPressureAction-&gt;setChecked(true);

     lineWidthTiltAction = new QAction(tr(&quot;&amp;Tilt&quot;), this);
     lineWidthTiltAction-&gt;setCheckable(true);

     lineWidthFixedAction = new QAction(tr(&quot;&amp;Fixed&quot;), this);
     lineWidthFixedAction-&gt;setCheckable(true);

     lineWidthGroup = new QActionGroup(this);
     lineWidthGroup-&gt;addAction(lineWidthPressureAction);
     lineWidthGroup-&gt;addAction(lineWidthTiltAction);
     lineWidthGroup-&gt;addAction(lineWidthFixedAction);
     connect(lineWidthGroup, SIGNAL(triggered(QAction *)),
             this, SLOT(lineWidthActionTriggered(QAction *)));

     exitAction = new QAction(tr(&quot;E&amp;xit&quot;), this);
     exitAction-&gt;setShortcut(tr(&quot;Ctrl+X&quot;));
     connect(exitAction, SIGNAL(triggered()),
             this, SLOT(close()));

     loadAction = new QAction(tr(&quot;&amp;Open...&quot;), this);
     loadAction-&gt;setShortcut(tr(&quot;Ctrl+O&quot;));
     connect(loadAction, SIGNAL(triggered()),
             this, SLOT(loadAct()));

     saveAction = new QAction(tr(&quot;&amp;Save As...&quot;), this);
     saveAction-&gt;setShortcut(tr(&quot;Ctrl+S&quot;));
     connect(saveAction, SIGNAL(triggered()),
             this, SLOT(saveAct()));

     aboutAction = new QAction(tr(&quot;A&amp;bout&quot;), this);
     aboutAction-&gt;setShortcut(tr(&quot;Ctrl+B&quot;));
     connect(aboutAction, SIGNAL(triggered()),
             this, SLOT(aboutAct()));

     aboutQtAction = new QAction(tr(&quot;About &amp;Qt&quot;), this);
     aboutQtAction-&gt;setShortcut(tr(&quot;Ctrl+Q&quot;));
     connect(aboutQtAction, SIGNAL(triggered()),
             qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;File&quot;));
     fileMenu-&gt;addAction(loadAction);
     fileMenu-&gt;addAction(saveAction);
     fileMenu-&gt;addSeparator();
     fileMenu-&gt;addAction(exitAction);

     brushMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;Brush&quot;));
     brushMenu-&gt;addAction(brushColorAction);

     tabletMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;Tablet&quot;));

     lineWidthMenu = tabletMenu-&gt;addMenu(tr(&quot;&amp;Line Width&quot;));
     lineWidthMenu-&gt;addAction(lineWidthPressureAction);
     lineWidthMenu-&gt;addAction(lineWidthTiltAction);
     lineWidthMenu-&gt;addAction(lineWidthFixedAction);

     alphaChannelMenu = tabletMenu-&gt;addMenu(tr(&quot;&amp;Alpha Channel&quot;));
     alphaChannelMenu-&gt;addAction(alphaChannelPressureAction);
     alphaChannelMenu-&gt;addAction(alphaChannelTiltAction);
     alphaChannelMenu-&gt;addAction(noAlphaChannelAction);

     colorSaturationMenu = tabletMenu-&gt;addMenu(tr(&quot;&amp;Color Saturation&quot;));
     colorSaturationMenu-&gt;addAction(colorSaturationVTiltAction);
     colorSaturationMenu-&gt;addAction(colorSaturationHTiltAction);
     colorSaturationMenu-&gt;addAction(noColorSaturationAction);

     helpMenu = menuBar()-&gt;addMenu(&quot;&amp;Help&quot;);
     helpMenu-&gt;addAction(aboutAction);
     helpMenu-&gt;addAction(aboutQtAction);
 }</pre>
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